Stone-polishing wheel



i atented May 22, i928.

STONE-POLISHING WHEEL.

Application led December 3, 1923. Serial No. 678,313.

My invention relates to devices designed forpolishing the rough face of a slab or block of stone, and the object of my invention is tovimprove the stone polishing wheel shown and described in Letters Patent ofA the United States ,issued to me April 2, 1907, #848,760. l

In the practical operation of machines of this type, I have found that in Wheels as ordinarily constructed, there is a tendency for the abrasive lmaterial to collect and cake on the inner side of the wheel flanges instead of remaining on the stone where the polishing operation is performed. n

An object therefore of my present invention is to provide a wheel having its flanges arranged in such a. way that the abrasive material will not adhere Vand cake on the inner faces thereof but will remain on the work.

A further Objectis to provide a stone polishing wheel which can be fastened to any type of cover'. r l

A further object is to provide improved means for pouring water upon the stone and feeding the abrasive material between the wheel and the stone. l

Other objects of the invention will appear from the following detailed description.

The invention consists generally in various constructions and combinations all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification,

Figure l is a plan view of the under side of a polishing wheel embodying my invention- F igure 2 is a partial plan view of the top of the wheel;

Figure 3 is an edge view of the wheel, and

Figure l is a plan view illustrating a modified construction.

In the drawing, 2 represents ametallic grinding wheel or disk, and 3 a plurality of depending flanges fitting against the under lsurface of the disk and secured thereto by suitable means such as bolts 4. These flanges are substantially semi-circular in form and have tapered ends 5 which are preferably arranged with their outer faces flush with the periphery of the disk. n

These tapered ends are substantially equi distant from each other on the surface of the disk being spaced apart on the periphery a distance equal'substantially to 90 degrees.

1 From the peripheral edge of the disk the the grinding operation,y

flanges extend inwardly in a wide `sweeping curve and terminate upon opposite sides of a central opening 6 lin the disk and separated from said opening by passages 7 substantially uniform in width and unobstructed to allow the free passage of the abrasive material.- Similar passages 8 are provided betweenjthe inner end of each flange andthe wall of the adjacent flange and the degree' of curvature of the flanges is such that vwhen the grinding or abrasive material is fed between the wheel and stone it'will not'be thrown by centrifugal force against the flanges vto `cling or adhere thereto, but instead will fall and remain on the surface of the stone and work between the stone and the grinding edges. of the flanges and keep these edges continually supplied with abrasive and thereby. greatly hasten and with less amount of abrasive 'than is usually required in polishing wheels 0f this type.

l have .built and sold a'large number of polishing wheels embodying the invention vof my former lpatent above referred to in the operation of which I have found a considerable body of abrasive material is required as there is a tendency for this abrasive to adhere to the .walls of the flanges due to their position on the disk and their degree of curvature. I have found in my present iiivention that the abrasive'does'not adhere to the flanges and my experiments have led lme to believe that the reason for this is because the flanges are set at such an angle that their cutting faces or edges pass across the abrasive nearly at right angles and centrifugal force does not cause it to adhere to the inner..

faces of the flanges as usually happens in other wheels of 4this type. Evidently the4 abrasive which clings to the flanges has no function in the polishing operation and hence by preventing this material from collecting on the wheel flanges I am ableto do f i the work with a less amount of abrasive andV l1 karranged in the disk between adjacentLf. flanges; these slots' being `preferably'curved` in form and of sutlicient size to allovvwvvater i to be poured therethroughandthe abrasive material to be fed onto the stone beneath the disk.

I have shown the polishing Wheel or disk equipped with fourof these gifindingflanges or scrolls but do not limit inyselt to this number as'it may be increased orvdecreased according to thevsize ofthe Wheel. lIn each case, however, I preferito arrangethe flanges substantially iii the manner shown 'for the purpose'of counteracting centrifugaly torce hWhich Would normally tend to throw the abrasive against the inner faces oi theflangcs and cause it -to adhere thereto. The slots in the ldiskshown in Figure 4- may of course be used or omitted as preferred.

I claim as myvinvention: l. Astoiie polishiiigvwheel comprising a disk formed with av centrally disposed dis-ff charge opening, a pluralityoi' scn'ii-circular *flanges depending from the underiiace of the disk, the outer'ends of the 'liangesbeing substantially-flush With-the 'perimeterof the --disk at -substantially'- equidistant points apart, and the diameter oi their circles being such that their innerfends lie'at spaced distances from the central opening and at opposite sides thereof/atapproximately the saine distance from the center of the disk asthel radial distance froin'their peripheral' points to the next flange in advance'and each flange terminating back. from the inner end of the "flange lyingto one side thereofand for- Ward of the innerend of the' liange lying to the 'other side thereof,` the flanges being disposed to' leave unobstructed spaces between ends them from one to /the other` and rbetween vtheir inner ends tothe center ofthe disk .and having the diameters of their circles connecting-.theirperipheral and inner ends lying in diameters of the disk and intersect- ,ing substintially at right angles the path of travel of abrasive material.

2.-.A:=stone polishing Wheel comprising a disk formed With a centrally disposed discharge opening7 a pluralityofLsenii-circular langesidepeiiding from the underface of the disk, thel outer` ends of.ltheflangeshbeing 'substantially lifush with the perimeter offthe e disk at substantially` equidistant .points apart,and the diameter of: their circles being such that their inner en dsilie lat spacedndistancesffroni the central :opening and at opposite sides .thereof at lapproximately fthe ,saine distance from the center` offthe' disk .as Athe radial distance' from .their seri )lierai l l points to the next llange inadvance and each lian terminating back troni the inner. end of the 'Flange `lying to oiies'idei'thereoiiand ioirvard of thel inner/end 'of the vflangeV lying te the other side` thereof;the'llanges :being posed between adjacent flanges fand 'curved to substantially correspond therewith.v

' In 'Witness whereof, I have hereunto set my hand this 26th day otl November 1923.

SAMUEL HOBERT MLLS. 

